Field help (ADF1CLELNK) 

The key for the link is linked to the type previously entered. For example, when the type ADP type (parameter) is used, this field is used to enter the parameter code or the name of a local variable. If the type ATB (table) is used, the code for a table in the database is used. In most cases, a selection window associated with the context opens so that a choice can be made from the possible codes. The list of possible links can be found in the documentation annex.